单选题 At an output quantity equal to 250, a monopoly firm faces a demand curve with a price (P) of $50, a marginal cost (MC) and marginal revenue (MR) equal to $10, and an average total cost (ATC) equal to $12. The economic profit for this monopoly firm is closest to:

A、

A. $12500.
B、

B. $10000.
C、

C. $9500.

【正确答案】 C

【答案解析】Economic profit = Total revenue - total cost, where total revenue = PQ and total cost = ATC × Q. So, Economic profit = $ 9500 = $ 50 × 250 - $12 × 250.